package string;

public class StringBuildDemo {
    public static void main(String[] args) {
        String str ="好好学习java";
        StringBuilder builder = new StringBuilder(str);

        builder.append(",为了找个好工作");//在末尾追加内容
        System.out.println(builder);

        builder.replace(9,16,"就是为了改变世界");//替换部分内容(含头不含尾)
        System.out.println(builder);

        builder.delete(0,8);//删除下标0-7的字符串
        System.out.println(builder);

        builder.insert(0,"活着");//插入内容
        System.out.println(builder);








        /*StringBuilder builder1 = new StringBuilder();
        StringBuilder builder2 =new StringBuilder("abc");

        String str ="abc";
        StringBuilder builder3 =new StringBuilder(str);
        String str2 =builder3.toString();*/
    }
}
